@pzmyers As a person who just had to move a many days old deer corpse from his property, your yellow mystery blob is VERY low on the ick scale. Of course, your blob is in what looks like an airtight container and my deer was not. I have photos (that I made to show the department of transportation the location of the carcass) of the deer corpse, but I think they would only be interesting to a deer pathologist or the deranged, so I won't share them.
:^)