I spent some time today going through the addresses connected to address #2 PR5KAV1aTkHuscQ6FmdGEM7abGwfAAWwr5.
This is believed to be coins left over from Btc-e/Wex. If you search this address on Google, you can find some evidence that this is true, aside from what Peerchemist already posted above.
Anyway, I decided to put together the following map showing all the addresses being used around 2018 when Wex shut down. You can see balances and which addresses PPC were being sent to.
Am I correct in thinking that address #11 also belongs to Btc-e/Wex? From what I can see, 807,606.86 PPC were transferred to address #11. 500,000 PPC were then transferred out of it to the address ending in EsG. 307,606.86 PPC were left behind in address #11 and never moved again.
Here are links to all of these addresses in case you want to check for yourself…