If Pierce's story is true, this could be less a function of Ray abandoning the team, and more a function of how so many NBA deals are already agreed to on the first minute of free agency.
If I know Miami is one of a few teams that's going to make me an official offer in about a month, and I'm in Miami with nothing to do, I'd probably look at some houses too. Doesn't mean I've made up my mind that I'm going to sign in Miami, just means I know it's a possibility, and I like window shopping.
Personally, I've looked up houses near potential new employers before I've had an offer or even knew if I'd accept an offer if one was given.
On the other hand, I can see how just the window shopping could rub some people the wrong way.