Could be a number of things, I've read about small holes being punched in letters/packages many times, some people think this is where an ion particle sniffer is used to test for drugs or other prohibited substances, if that's the case though the particle sniffers don't sniff for shit as everyone who posted got their orders without any issues. It's more likely due to the rigors of having traveled through the postal system, as others have said stuff gets pretty beat up coming through the system. You should however look into getting a safe drop i.e. not your home address, not worth the risk of ordering especially internationally to your home, do not shit where you sleep.