I lost my requinto.

I really messed up. Yesterday, while getting ready for my guitar lessons—packing my instrument into its case along with my picks and the amplifier cable—I realized my requinto was missing.

This wouldn’t be such a big deal, except that I have an instrumental showcase coming up in less than a month, and the song I’m supposed to play requires a key change.
I’ve looked everywhere, but I can’t find it.

 I’m starting to get worried; a couple of days ago, I went on a camping trip and brought both my classical guitar and my requinto—I think I might have left the requinto at the campsite, though I’m not entirely sure.

Anyway, I had to go to class without it, so we practiced a different song instead. I need to find it fast, or else I’ll have to buy a new one. (I really hope it’s the former, because I spent my entire allowance on my electric guitar and I don’t have any money left!)