Records not stored vertically for decades

So since you have about 200 albums, I would run them all thru a US RCM. That will get rid of any mould/dirt/dust, etc. The only ones I would worry about for warping are the top 5-10, since they would not have much weight on them. Vinyl is heavy, so anything under those would be fine from any warps. 

My 2 cents... Good luck and enjoy when you get everything back up and running. Lots of fun. Just finished listening to Analogue Productions Gaucho - 45 rpm - re-mastered by Bernie. Another home run if you are a SD fan.

really good SD would be Analogue Productions - they just released - well you can order them - Aja and Gaucho and maybe one other have shipped - all 45 rpm, all remastered by Bernie. I have the Mofi of Aja and the AP version is much better - dynamics, black background - esp the cymbals at the end of Aja - the Mofi version they are very muddy - like they were distorted on the original - much more listenable on the AP version.Gaucho is great - music and sound. Not cheap - $150 a pop, but if you are a SD fan, must haves.

I forgot - after you clean your vinyl in the US RCM, get some rice sleeves for them - Mofi and AP have them, as does Square Deal Recordings and Supplies on eBay - much cheaper than the other two and just as nice, if not nicer. Throw out all the paper ones unless they have rice liners.

Anyway, have fun listening to the new SD and getting your system up and running. Its a fun hobby and I have discovered a ton of great artists - Discogs is my new best friend.