SRPA file XX458198 details the items found on dead Chimera. It suggests that either the Chimera pick up items at random as a sort of 'magpie' reflex, or that the Chimera may retain memories of their life as a human...
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U.S. ARMY OFFICIAL REPORT
NOTES
Effects File. XX458198
This is a very partial inventory of objects found with
dead enemies. The assumption is that they were
carrying them with them.
It's possible that this is some sort of magpie reflex,
that is, that they pick of objects at random. There
has been some speculation that after transformation,
they may retain some very vestigial memories of their
previous life. A horrifying possibility.
Toy
Soap
Shoes
Watch
Holy Card
Key
Dentures
Baby Shoe