To understand, you have to look in detail at what happened to these 7 wallets, from the very beginning:
Take 1BAF. On 4 May 2011, it receives 10,000 BTC. That is $1bn today. At the time it was worth next to nothing. BTC had reached parity with the dollar only 2 months earlier. The funds come from 2 addresses:
Tracing back the transactions of the various accounts, two surprising things stand out (besides the fact that all this was 14 years ago):
These accounts don’t look like genuine user wallets, but rather intermediaries, such as proto-exchanges or OTC desks.
The 9,000 BTC come from a transaction that took place 6 months earlier, on 21 December 2010. Besides one line of 3,200 and another of 2,200, making 5,400 BTC, there are also 72 lines of 50 BTC. Several seem linked to the same wallet, so they are ordinary transfers, but 68 of them are coinbases, in other words mining rewards.
And we are dealing here with very, very early adopters, since the user in question, probably the same one behind all these wallets, was mining blocks in May 2009, when Satoshi Nakamoto himself had mined the first one on 3 January 2009. Either this is a very, very early adopter, or a payment or gift from Satoshi to a very early adopter… or it is Satoshi himself.
As for the wallets themselves, they were created on 2 April 2011 (2x 10K BTC) and on 4 May 2011 (3x 10K BTC, 11,326 BTC and 10,006 BTC).