Bit out of my range of experience.
Attached is a scan of a cover which was sent to the mother of an old friend in 1946. I found this among the effects of our friend when she died last year.
Can someone give me information about the FPO? Particularly the location?
Many thanks[attach id=6488]Image-_9_.jpg[/attach]
Proud Volume III showes it as:
M.E.F. 179 Bde (FPO B179) (12.4.46) - (7.6.46)
next entry is:
Held by B.A.P.O. 2.6.47
So presumably your date of AU 15 / 46 extends the period of use by 179 Brigade.