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I've received an enormous BTC transfer that's clearly in error - now what?

Hi Stacker News.

I use a wallet notification service (cryptocurrencyalerting.com) on one of my cold wallets and I received an alert on Friday morning of a balance change. I naturally shat my pants because I haven't shared the address with anyone and really use the service just as a way to know if someone I were to get hacked.

It looks like the opposite has happened - the alert told me that the balance of my wallet increased by just under 6 BTC. I stared at it for a minute and thought ok they've clearly screwed up - but... I retrieved my seed phrase, spun up a new cold wallet and yeah - my balance is up nearly 6 BTC. 

How the hell did this happen? Aren't addresses supposed to be unguessable? What do I even do now? I found the on chain transaction using mempool but what do I do with that information? 

I didn't want to post this on Reddit because that's going to attract a lot more scammers. Any ideas or guidance would be greatly appreciated. 