A Mysterious Document Surfaces

The Zymoglyphic Museum has somewhat of a reputation as a "museum of decay" (undoubtedly a factor in its recent targeting by the Museum of Dust). A mysterious document has recently surfaced that may or may not help explain the origins of this phenomenon. This loose notebook page was found deep in the curator's personal archives. It appears to be the record of some sort of archeological dig, apparently in his closet. The manual timestamp on the document indicates that the dig was most likely in preparation for leaving home and heading off to college a continent away.

Here is a literal transcription of the document:

2 very stale pieces of bread w/casts of pupae, presumably carpet beetles, as dead same found there also. Open can, no mold on bread
Cardboard can w/mistletoe, dead and moldy
Separate substance so moldy as to be unrecognizable
Piece of wrapped cheese, brown liquidy and stinking like hell
Dried leaf of lichen, brown but not moldy
Plastic dish with spoon and white powder
Nylon plankton net
Mold on plate under glass, indicating square outline of something that had been there. No smell.
Jar with moldy prunes - now only moldy pits are left & some gunk on sides & bottom of jar. No smell. Rotting for many years
Old spider nests in jars found in closet - explains spiders in here. Jar w/bread(?) explains beetles. Now how did sow bugs get in here?