I bought a denarius of Julia Paula from England that turned out to be fake. That was decades ago, but ten years after I bought it, I met the dealer face to face at a Sydney coin show. Although I had already given the coin to another dealer to add to is reference 'black' collection, I came away from the meeting with the guy who sold it to me that he had made an honest but careless mistake.
That experience left me with the attitude that I must investigate how different types of fakes are made, because their method of manufacture always leads to their betrayal, provided that rational and careful investigation is done. Now, I have a reasonable specialist reference library on the manufacture and identification of fake coins.
I have to agree, some of them look 'off' to me as well, but it is always hard to pass conclusive judgement on suspect 'borderline' coins from on screen pictures. If I number the coins (obverses):- 1 2 3 4 5 6 1: fake 2: fake 3: genuine 4: genuine 5: fake 6: genuine Same opinion applies to the reverses. I stand to be corrected.
Examine the radial flan splits with a high powered loupe, looking inside them for evidence of tensile metal distress, which is always a good sign for a die strike, as opposed to cast coins.
Silver crystallization and horn silver can support evidence of ancient manufacture, but they could still e ancient counterfeits. Beware! Silver coins suffering from these problems can be fragile.
Good to see that you have already visited Ancient Coin Forum fake site. Check all other reference sites for fake ancient coins that you have access to.
Be that they be may die struck or cast, copies off copies always produce 'mushy' devices and lettering on the the fake product. Pressure die casting can mask this problem.
XRF can be very useful for ancient coins. The ancients were only able to refine silver to about 95-98%, before adding alloying metals. If they have modern manufacture, it is the trace elements and impurities in the alloy that need to be considered, not the silver copper zinc or lead only, and nothing else that would be found in a coin of modern manufacture.