This is an old thread but I'm going to reply anyway - What I do with found money like this is use my standard found money policy - it's a 3 way split.
A third would go toward the PAST - sorry I'd have to put some on paying down my mortgage. (I touch my house everyday!

)
A third would be spent on the PRESENT - maybe a taco lunch at the ol' Bell &/or movie at the afternoon matinee for myself & children at $2.00 per person. Change leftover would go in the change jar to be shuttled to savings account on Saturday's bank run.
The last third would go to the FUTURE - I'd slip it into a tee-tiny CD at INGdirect.com or go long on tuna or whatever else was on sale down at the grocery!
--LuxLivingFrugalis
http://LuxLivingFrugalis.blogspot.com