Anyone recognize this address?

[IOBA]

Anyone recognize this address?   It's listed as "Undeliverable Mail Only"

POB 2630, Southgate, MI 48195-4630

Of course, no company name.  It came for my sister.  I do have a POA so I could open it.  If I give it to her, it will end up "lost" forever either in her clutter or her trash.

I'm pretty sure its a collection notice.

[laz98]

all my sister's collections come from southgate, michigan.  couldn't find anything on a quick google search.  pretty sure that's where they come from.

[IOBA]

This may require opening the letter...

Mystery solved - RPM (Receivables Performance Management LLC) based in Lynnwood, WA for Sprint.   RPM is authorized to work out a payment plan on behalf of Sprint.