Secure an IKEA TV stand to the wall

If you do decide to attach with screws you should use what are called fender washers between the head of the screw and the plastic. The fender washer has a larger diameter than a normal washer and is meant for situations where you need to spread the force of the screw over a larger area. This will make it less likely that your screw will crack the plastic or pull through. Additionally. When tightening the screws slow down as you get close to full depth and gently bring the screw to full tightness against the washer and plastic. This will minimize the chance that you will create cracks in the plastic with shock. if your box is made from a brittle plastic it might not hold its own weight with out cracking. In this case a small piece of wood that would span between two holes that you could screw through to hold it to the wall. This would create a larger clamping surface and spread the forces over an even larger area than the washers. If none of this makes sense it would help if you could describe the box a little bit or even supply a picture.

Yes, it can be very true indeed that the 'wooshing sound' that you are talking about is the result of the scrap material that was left unchecked during the production of the furniture. Many a times when hollow parts/ material (like the bamboo arms for wooden chair) are used for designing the furniture, the fine particles of wood dust or scraps resulting from the use of chisel or any other tool may get accumulated into these cavities. I have been working as a furniture repair guy at the Austin Furniture Repair where I have a lot of these cases. So, rest assured as it might not really be that big a problem. Hope it helps!