First, I wouldn't expect any response whatsoever to thank yous. Many of these attorneys barely skim it, let alone have the time or inclination to respond.
And if they told you to expect an offer 24-48 hours, and you haven't received one, if it were me, I probably wouldn't expect an offer at this point. I'd give it a week after the interview, and if you don't hear anything, then maybe give a call or email the recruiting coordinator and just see what's going on.