E762 should end at border? What’s your source? And Which border, no E762 in Albania at all? I‘m a little bit confused now.
1) Officially it does. And, until yesterday, it did on TM/CHM as it had for over a decade!
2)
the AGR itself:
E 762 Sarajevo - Podgorica - Border of Albania
E 851 Petrovac - (Albania) - Prizren - Priština
E 852 Ohrid - Albanian Border
E 853 Ioannina - Albanian Border(for reference, the E86 is defined as ending at the Greek village near the Greco-Albanian border, rather than the border itself).
There are zero formally defined E Roads in Albania, and Wikipedia is wrong whenever it says there are.
3) the northern border, so no E762 in Albania....
However, on finding a picture of a signed E road in the country, I've investigated signed routes of E Roads in Albania to include them like we include signed extension/branches/duplicates of E Roads that aren't in the International Agreement (AGR) that defines the routes - eg the E7 on the A65 in Gascogne, or the E401 on the A16 in Picardy.
They aren't signed that well, but the E762 is signed in places along SH1 north of SH41, the E851 is signed in places along it's obvious route, the E852 is signed in places from Pristina south (and maybe a bit further north, but I wasn't fully convinced it goes and meets the E851 north of Tirana) and the E853 and E86 not at all along their supposed routes.