"Is there anyone out there"
Once in a while we can put together a good write up even when the item is only a Front. Once such item shown on the attached scan,
What a story it could have told us if complete. Based on the address I presume it first went to Salonika probably arrived early September 1917. Battalion had left for Egypt in early July.
What happened between then and 12 May 1918 where it was cancelled FPO 180 (location uncertain) Transjordan area is impossible to say.
Enjoy
Chris