Way to go! A friend of mine picked up a Rollieflex TLR a few years ago at a yard sale. It was clearly never used and still in a minty box and instructions. At the time, he wasn't a serious collector, but knew it was worth more than the $150 asking price.
Good for you on the 58/1.2. I'd love to own it, but I'm really happy with my 50mm f/1.4G on my F5.