Unfortunately, the strong light blew out the metallic blue wings. To refresh, here is the original beetle:
They were roughly the same size and found in the same habitat (forest edge). Does this prove anything? Absolutely not. It would be pretty hard to "prove" that the beetle is a mimic - perhaps impossible - and thus my assertion is entirely unscientific. But I did imagine the existence of a medium-sized metallic blue wasp with orange legs and sure enough, it showed up!