Google says you need exceptionally pure paper to make albumen or the chemicals will react horribly with any impurities and it will ruin the print. The only way for the process to work is for the paper to be modern. Old paper has all kinds of impurities built up and old photo paper still in the original box doesn't exist as far as I can see, and even if it did, I would think the chemicals would be degraded by now and it would make it unusable.
That's why it's probably extremely hard to make modern fakes look old...the paper has to be modern and that's easy to tell.
An easy way to tell for sure would be to get the paper carbon dated, IMO. The carbon dating process is now a lot more precise and a lot cheaper than before. The last time I checked it was like $500-600 for 1 sample.
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