I bought anything between 500 and 1500 BTC back in 2009 or 2010, can't remember the amount exactly. I downloaded electrum on my PC, and spent a couple of days teaching myself to transfer between wallets. I wrote down the seed words for each wallet in a note book and once I was successful in making a few transfers I totally forgot about Bitcoin; until 2016 when the price of Bitcoin started rallying like crazy.
Here is one of the transactions, see what you make of it and let me know.49b17aaeb9308d2d314438baf6321033af09f62c0e9914e5b01ac4d7ba481a4d bc1qmuuc762cw02gg9j7fmqrw0wcmr0ffm5xkxjnln 10.78134
This doesn't make sense. While Electrum exist since late 2011, seed/recovery words generated by Electrum 0.X can't be restored to much newer Electrum version.
And "Bitcoin Foundation" isn't some sort of a centralized body that governs Bitcoin, BTW.
Bitcoin Foundation is considered dead anyway, although their website is still alive.