good info guys. KK, you krack me up

If interested normally I would send the seller a PM. ( you can do this by clicking on their name and clicking send PM under their name on the page that loads )
You can also post "PM sent" in the thread if you want. This also alerts the seller.
It's a Private transaction as stated above. If it's a newer member, like yourself, they may want to meet you at HPD to do the transaction and complete registration transfer. Some sellers will only do it this way to ensure registration transfer.
Myself, if it's a long standing member with meaningful contributions, I normally just complete the agreement of sale with their current permit number and let them go register it within the 5 days. Of long standing members, no ones burned me yet by not registering. Could be risky though if someone didn't register it.