In the Label options dialog, try
a. Check Printer information->Page printers
b. Select Label vendors->Avery US Letter
c. Notice that the label names are sorted in alphanumeric sequence
rather than numeric sequence - e.g. if you had 1,2,3,4,5,6,7,8,9,10,
instead of being presented in that sequence you would actually see
1
10
2
3
4
5
6
7
8
9
So look down till you see the numbers starting with 5, then the numbers
starting with 53, then the numbers starting with 536, then you should
find it.
Let's hope that's the right one.
Peter Jamieson
http://tips.pjmsn.me.uk