I think it's great that your Wife has given you the key, code and wants you to move back in! These are good signs but you are wise to be questioning if it's too soon - I can only hope I would be so wise. It sounds like she is preparing herself to trust you (and herself), and yet isn't all the way there yet.
My H told me months ago I could go to the house if I wanted to, even if he's not there. I said I wouldn't (we had a big fiasco in Jan when I did this, and found letters to OW). Now, I didn't do this until one day about 2 months ago. And I picked a bad time- and got hurt again. Neither of us were to blame, and I reacted VERY differently than last time, but it still was a bad idea.
Be careful. IMHO I would be appreciative of these steps and just hang on longer (don't spring stuff on her) until you know that she will not be scared off by it.
