It's about 8 years already passed away now the owner remembered that he had some BTC around 3000. He wants to exchange them now?
Oh no, did the year died? LOL!
Anyway, OP mentioned that the funds were transferred and didn't sell.
Moreover, that person or group surely a long term holder, imagine that he missed or didn't sold his bitcoin when it's on ATH last 2017. That profit he could get tho. Or he really have a lot of bitcoin keeping on different wallets. Envy those guys, erffff.
Well it cant really be avoided for majority of us would really got jealous or envy on what they do possess. We wouldn't able to know
on whats behind those dormant address goes to active but doesn't being moved out but one things for sure that the owner/s of those wallets
do remember out that they are holding something that do talks about millions of dollars.