Just bought a new (to me) Trek Madone and now realize it is a WSD

I just bought a Trek Madone 6.2 (2011 model) for $800 off of Facebook Marketplace. Rode it around the neighborhood before I bought it and it fit like a glove at 54cm. Got home and realized it is probably a WSD! I'm 5'11" but I wear pants with a 29 inch inseam. I'm pumped to have gotten such a nice bike so cheap.

Thoughts?