The yellow looks like its on a blue grey material making it Luftwaffe Flight Shoulder strap. The Blue would be Medical.
Not sure whether the second Lt board is red or orange, red would be Artillery and orange would be MP.
The rank chevron is also Luftwaffe and for the rank of Obergefreiter.
$75 for the lot is not a bad price at all....
I would grab them all for that price.
JEDEM DAS SEINE
I don't think either of the bullion boards are artillery, the detail of the bullion with the highlight threads is not something I would expect to see for artillery
The blue heer board could be transport, though medical could be right, it depends on the shade of blue.
The obergefreiter winkel also looks to be luft.
Here are a luft signals board and an artillery board for comparison.
Whatever its just an opinion.
Are the bullion ones not WW1 items?
The blue looks like the darker cornflower blue, so medical for sure.
Tress design is not always the only way to determine branch of service as can be seen below.