Actually, the Platinum Desk had the Boston DL lost and found number. 617 568 0885. The answering machine (voicemail prompt?) said this was the BOS DL baggage claim office. Left a message, hopefully they will call back. Can't file a claim as the baggage claim rep in MHT kept my claim ticket (or somehow I lost in in my desire to flee).
Fingers crossed and hope this info is helpful to others in the future.
PS...only Diamonds have dedicated bag service line. Who knew?