It's possible that the reason the TB has not been logged into the cache correctly is because the cacher is on holiday and hasn't had a chance to get on-line and do the "dropped off" log yet, so when this sort of thing happens it's considerate to wait a while (maybe give them a week?) before doing anything.
If it still hasn't been correctly logged in then, from the TB's page, you can do a "grabbed from <name of first cache>" log, which will put the TB into your account. Then, to keep the record of the TB's jouney accurate, you can "dip it" in and out of the cache where you did find it.
MrsB
After the retrieve happened more than two weeks ago, I did as you described. Thanks for your help.