You moved it into your batcave? BIG MISTAKE.
That piano may or may not be any good as an instrument....one thing for certain however...Taking it and leaving it into a non-climate controlled garage is how, if it was any good in the first place, you kill a good piano. Putting it out there will wreck the hammers, the soundboard, you name it. Get in touch with local musicians who-know-someone-who-knows-someone-who-knows-someone to have a good player take a look at it. Pianos are ultra-fussy about climate and humidity does a number to them.
After being in storage for 5 years in god knows where and then in your garage, it might need a ton of work (read $$$-$$$$) to be really up to snuff again.