It's nothing to do with being a new guy. So please do not take it personally. "Tough" tends to have a negative flavor - I would prefer "rigorous". And the rigor is in the interest of your wallet!
You did the right thing in coming to this forum, as the collective eyeballs of forum users will often pick out aspects that a single person might overlook. But to make use of that collective experience, photos are of the essence.
And please beware of the word "original". The swapping out of parts to create what is presumed to be an original configuration for a particular date or number range is so easy that it is
not possible to guarantee that a rifle is original (in the sense of being the same assembly of parts as left the factory) merely because the parts match the approved configuration. In this matter one must be rigorous - even tough - and inspect the rifle minutely for signs that parts have been retrofitted. This is often revealed by differences in wear, scratches, dirt etc. All aspects that require no particular knowledge of the type of rifle, but a sharp eye for material inconsistency.
So in the end, even with the best photos, no-one will be able to guarantee that the rifle is original. All we will be able to say is that (hopefully) nothing is visibly wrong. Considering that the price that the seller is looking for is 8 times the price of my 1943 original-enough-for-me
Garand
, you certainly should be rigorous in evaluation - of the rifle and the seller!
At the price level that you are considering, one should a) have the rifle examined by an acknowledged expert and b) obtain a written guarantee from the seller that he will take back the rifle and return the money if the rifle is subsequently proven not to be as he claims. Remember the old saying: verbal claims are not worth the paper they're witten on!