I used a tool I found in another thread that is supposed to use your phone's model and serial number to download the proper firmware, but once again it identified my phone as a P500 and downloaded a European firmware. The thing is, I'm considering trading my phones in for something with a hard keyboard (Probably the HTC G2) and I obviously can't turn the phones back in to T-Mobile with custom firmwares and recoveries on them.
I do still have nandroid backups of the original firmware from before my first flash about 6 months ago. If I were to nandroid flash back to stock, is it possible to remove the Recovery and then unroot the phone? I'm sure this has been covered adnauseum elsewhere, but I haven't found anything specific to the LG P509-T.