Help with GW letters

[Anonymous]

Ok since reading these forums I have paid and gotten 7 medical collection accts removed from my credit.  Now I am ready to send GW letters for removal of late payments.  My question is where to send these letters and how to send them.  I know that I have read several places that you should mail them to where they have to be signed for so that there is a paper trail, but most of the addresses are PO boxes.  Can I still send them to be signed for?  Also how much of an increase can I expect with the medical collections being removed? Also how will I know when they have been removed without running yet another inquiry on my report?  Thanks.

[Anonymous]

GW letters should not be sent CMRRR.  If you are sending correspondence that way, you can still send to a PO box.

[RobertEG]

GW letters do not even require a rsponse by the creditor, so there is no need for you to get proof of receipt.

Proof of receipt is important when date of receipt has statutory periods, such as DV letters and affixing a date of a notice of dispute.