Crime scene investigator Calvin Miller finds a firearm left at a scene. He takes an evidence collection box, picks up the gun by sticking his pen in the barrel, deposited it into the box, and seals it for delivery to the lab. He then sees three bullets lodged into the wall. He takes a set of tweezers and pulls out each bullet, until it is free from the wall, and then places them together in a small paper bag to be sent to the lab. What, if anything, did he do wrong in the collection process?