I accidentaly lost the sticker

I suppose you could call up xbox support. Just tell them your sticker fell off and ask if there is any where else you can find the serial. They may be helpful because they are doing this to avoid lawsuits. Its not like they can prove your box is modded because your sticker fell off. However they may say your warranty is void because your sticker is off.

Say the ink 'rubbed' off with wear and tear.

I Know With Avalunch Under Setting foolin aroud with that it tells u ur xbox serial number

Sucks for you.......

well if you can get to the ms dash go to network options and click connect it tells you your serial number above, but it sucks if you have a mod you cant turn off because you will be banned unless you got a bios that stops live from connecting and it will tell you that you have a dns error

i will ship u mine for 5 bux!!!!!!!