Fallout 4 where can I find more 5mm ammunition

There are a few sites (like this one) that have lists of source materials for copper. I basically pick up everything I can and take it back to my workshop for scrapping. Most of the items that contain copper seem to be electrical items, like lamps/fuses, hot plates, etc. I keep an eye out for those items while I'm scavenging.

Regarding the "large quantities" part, I think that's the challenge. I've been roaming for quite a while, so I've picked up quite a few toasters and hot plates/etc, but they never have tons of copper. It's just a constant struggle to keep an eye out for it.

For reference, I'll repost them here.

Acid – Abraxo Cleaner; Anti Freeze Bottle; Suprathaw Antifreeze;

Adhesive – Duct Tape; Sealed Wonderglue; Vegetable Starch;

Aluminum – Coolant Cap; Distress Pulser;

Antiseptic – Abraxo Cleaner; Turpentine; Abraxo Cleaner;

Asbestos – Biometric Scanner; Coffee Pot; Extinguisher; Oven Mitt; Pack of Cigarettes; Teapot;

Bones – All Bones (ex: Tibia); Animal Parts and Corpses

Broken Light Bulb – Street Lamp;

Ceramics – Bathtub; Toilet; Ceramic Bowl; Coffee Cup; Sink; Teapot; White Plate;

Circuitry – Alarm Clock; Distress Pulser; Enchanted Targeting Card; Military-Grade Circuit Board; Telephone; Hot Plate;

Cloth – All Dresses, Suits and Outfits (ex: Laundered Green Dress); All Hood and Hats (ex: Hood with Straps); Box of San Francisco Sunlights; Cigar Box; Couch; Kitchen Chairs; Pre-War Money; Last Edition Newspaper; Pack of Cigarettes, Paintbrush; Rug; Trifold American Flag;

Cork – Antique Globe;

Copper – Fuse; Hot Plate; Light Bulb; Power Relay Coil; Telephone; Vacuum Tube;

Crystal – Camera; Microscope; ProSnap Camera;

Fiberglass – Abraxo Cleaner; Cigar Box; Jangles the Moon Monkey; Telephone;

Fiber Optics – Biometric Scanner; Microscope;

Fuse – Street Lamp;

Gears – Adjustable Wrench; Camera; Desk Fan; Gold Watch; Microscope; ProSnap Camera; Typewriter; Silver Pocket Watch;

Glass – Beer Bottle; Empty Milk Bottle; Fuse; Glass Pitcher; Lamp; Light Bulb; Nuka Cola Bottle; Shot Glass; Vacuum Tube;

Gold – Gold Items (ex: Gold Watch, Gold Lighter);

Leather – All Hides and Leathers (ex: Radstag Hide); Some Arm and Leg Pieces (ex: Leather Left Leg); Gas Masks; Harness

Nuclear Materials – Alarm Clock; Biometric Scanner; Distress Pulser; Nuclear Material;

Oil – Blue Paint; Flip Lighter; Gas Canister; Oil Can; Soap;

Plastic – Automatic Institute Pistol; Bread Box; Enchanted Targeting Card; Files; Plastic Spoon; Pack of Cigarettes; Shopping Basket; Scissors; Anti Freeze Bottle;

Rubber – Baby Bottle; Fridge; Street Lamp; Tire; Extinguisher;

Screw – Antique Globe; Desk Fan; Hot Plate; Typewriter; Toy Car; Toy Truck; Antique Globe;

Silver – Silver Items (ex: Silver Fork; Silver Locket; Silver Bowl); Enchanted Targeting Card;

Spring – Spring; Camera; Flip Lighter; Kitchen Scale; ProSnap Camera; Typewriter;

Steel – All Pistols and Rifles (ex: Pipe Auto Pistol); Ball-peen Hammer; All Melee Weapons (ex: Tire Iron); Some Armor Pieces (ex: Raider Left Arm); Blue Paint; Extinguisher; Flip Lighter; Gas Canister; Kitchen Scale; Mailbox; Oil Can; Radiator; Safe; Shopping Basket; Screwdriver; Scissors; Stove; Street Lamp; Toy Truck; Turpentine;

Wood – All Trees (ex: Maple Tree); Wooden Objects (ex: Table); Ball-peen Hammer; Box of San Francisco Sunlights; Cigar Box; Paintbrush; Picture Frame; Screwdriver; Trifold American Flag

The regular Lab Coat (+2 INT) can be found in the following locations:

• Anne Hargraves sells one if she is assigned to a clothing store.
• A lab coat can be obtained if one is given the lab assistant job during the Cambridge Polymer Labs quest.
• Patricia Montgomery at Covenant wears one.
• Tinker Tom sells an armored lab coat.
• Doc Crocker's lab coat can be looted from his body after the quest The Disappearing Act.
• Worn by Doc Carrington and T.S. Wallace.
• Doctor Sun and Doc Weathers wear one.
• Worn by Doctor Amari in Memory Den.
• Worn by Miranda Song at Vault 81.
• (Far Harbor DLC) Teddy Wright wears a lab coat.
  The Institute lab coat variants, the Vault-Tec lab coat, Father's lab coat, and Cabot's lab coat also give a +2 INT bonus.

The glasses you are referring to are Liam's glasses (+2 INT, -1 CHA), and can be found during:

the quest Plugging a Leak, given by Justin Ayo at the Institute, available after Mankind - Redefined. You must side with Liam in framing Justin, and pass the speech check for additional rewards to obtain the glasses.
Be aware that this quest will be unavailable if you have completed Tradecraft, which is an early quest, making these easily missed.

Other items that give an Intelligence bonus:

• Permanent effect:

  • Bobblehead: Intelligence, INT +1 ("In the northwest room of the Boston Public Library sitting on a control").
  • Perk: Night Person, +2 / +3 INT (between 6 PM and 6 AM).
  • Construction: Overseer's Desk, +1 INT (Vault-Tec Workshop DLC, limited)
  • Level: S.P.E.C.I.A.L. ability, +1 INT / level (up to 10, opting for a S.P.E.C.I.A.L. bonus instead of a perk)

• Semi-permanent effect:

  • Outfit: Destroyer's Helmet, +1 INT ("sold by Penny Fitzgerald in Covenant").
  • Outfit: Institute Division Head coat variants, +1 INT.
  • Outfit: Mechanic jumpsuit variants, +1 INT.
  • Outfit: Fancy suit & tie, +1 INT (Nuka World DLC).
  • Outfit: Acadia's Shield, +1 INT (Far Harbor DLC: "Given by DiMA if The Way Life Should Be quest is completed in his favor").
  • Headwear: The Captain's Hat, +2 INT (Far Harbor DLC).
  • Headwear: Inquisitor's Cowl, +1 INT (Far Harbor DLC).
  • Headwear: Mechanist's Helmet, +1 INT (Automatron DLC).
  • Headwear: Press cap, +1 INT.
  • Headwear: Tinker headgear, +1 INT.
  • Headgear: Ushanka hat, +1 INT.
  • Glasses: Road goggles, +1 INT.
  • Weapon: Legendary 'Sharp' effect, +1 INT.

• Temporary effect:

  • Consumable: Berry Mentats, +5 INT.
  • Consumable: Daddy-O, +3 INT.
  • Consumable: Mentats, +2 INT.
  • Consumable: X-Cell, +2 INT.