original photo paper comes unmarked as well as marked.It is nice to see pre war and wartime maker marks,but this is simply a bonus.
Examples of pre war and wartime papers are,
Gevaert ridax(belgian).and also just "ridax"
Agfa lupex(german)can be just seen as agfa,but agfa on its own is also postwar,
Agfa brovira(german)manufactured post war but known as afga brovira speed.
velox(unknown by me at this stage)
There are others but im going off memory .ill recheck my files.but unmarked paper is as original as marked.
As for photos being glossy,photos came in 4 finishes.Gloss,semi gloss,satin and flat.Some of the glosses are high gloss and it depends on the qaulity of paper.but certainly some originals had a very high level of gloss.
As for photos retaining finger prints,this has been a problem of photos since the very first one was taken.How much a photo retains a finger mark is dependent on many factors.How sweaty the hand is,the acidity level in the sweat and also the type of paper,High gloss photos show finger prints much more readily than flat finish photos.
Nothing to do with originality.
wether a photo wrinkl or cracks is dependant on storage.paper dries out and phots stored in dry environments will most certainly show adverse effects.
again nothing that instantly indicates originality.
A great percentage of third reich photos were developed post war.The developing techniques were the same up to the mid 50,s.Original paper was available through normal developing outlets upto the mid 50,s(untill stocks ran out.
A lot of soldiers couldnt get their photosdeveloped during the war>Due to location,cost and access to development shops during the war.