So I get back to work yesterday morning after the long weekend, and this is what I find on my desk!
Yes, that is indeed a dead lizard and a peanut can full of mushrooms! To be more precise it is an Alligator Lizard, Elgaria multicarinata, and shaggy parasol mushrooms, Chlorophyllum rhacodes. I am not sure exactly how they turned up on my desk, but in this line of work it's pretty common for people to drop off interesting things for you to identify.
This is especially true when you start to survey urban biodiversity through citizen science projects like Lost Lizards of Los Angeles (LLOLA). Myself and a number of other Museum staffers frequently return to our desks to discover dead lizard specimens. However, don't be compelled to follow suit. It is much more valuable to the project to follow the instructions and submit only your lizard photographs. Check out the LLOLA website for instructions on how to participate.