UPDATE: Found!!
“Dear PoPville,
Very strange request here! I have a lovely boyfriend who is the sweetest guy in the world but a couple of months ago he got a concussion and is suffering from memory issues. Yesterday he parked his car somewhere in Dupont Circle and since then he hasn’t been able to remember where he parked it. We called 311 and it hasn’t been towed.
I am going to go walk around again now to see if I can find it but I thought some hive mind might be helpful.”
UPDATE: Found!!