that is not a rumor, WB becomes illegal on 1/1/13 so even if the emission deisgnator is still listed there it is no longer valid. you do not have to remove it, they will do so automatically at the next renewal if not sooner. just make sure you are not using WB anymore!
as to not having the FRN and PW, you can pull up the license on ULS and it lists the associated FRN. if one is not listed then none has been assigned, which is very rare and usually only older licenses. all you have to do is call/email the helpdesk and request a PW reset. they call the listed contact and verify you are authorized, then reset the PW for you. i do it all the time, even when teh contact person is no longer valid it is fairly easy, all you need is the FRN, tax ID(business or social security #) and answer a couple questions. they usually call in 10-15 minutes after i email, though occassionally it is the next day. sinc eyou are moving the base it requires relicensing any way, but if you run into this again on a straight add NB/update contact now you know how to do it.