Quantum emergency scam on Coinkite hardware wallets

[Cricktor]

Is it anywhere confirmed that only Coldcard buyers (or general Coinkite customers) received such targeted snail mail?

I would assume that there's some sort of leak simply because snail mail isn't for free and if you pay for your scam letters a scammer wants to do it as targeted as possible. It doesn't make sense to receive such a scam letter when you're no Coldcard customer.

And Coinkite not knowing if they lost customer data doesn't say much or worse opposite if they had bad opsec.

It could be as with Ledger (again) recently: not our fault, a contractor we chose leaked the data, not our problem. Dooh!  
(What Ledger refuses to admit or communicate is that they are still responsible under EU GDPR for a failure of a sub-contractor. They can't wash their hands clean for the occured personal data loss at their sub-contractor. They can sue their sub-contractor but that doesn't solve the data loss and privacy issue. Who still buys Ledger crap anyway?)

[Coloma612]

The mail letter looks too official, address and name was well composed to look convincing and real but it's scam.

Phishing campaigns are getting much more sophisticated lately. Even if Coinkite claims no data leak happened users should remember that their emails could have been leaked from third party services like shipping companies or marketing platforms used by these manufacturers. The rule is simple never enter your seed phrase on any digital device regardless of how official the email looks

[satscraper]

I expect more scams to come through this form, even the ledger that has data leaks will start to receive this scam, be at alert incase you have there hardware wallet.

If you compare that letter ^{which attempts to impersonate Coinkite officials} with the similar one received by Trezor users

 you can easily spot that both originated from the same group of fraudsters. They shifted the focus slightly toward the buzz around quantum computers, but the final goal remains unchanged,  they just want users’ wallet seed phrases.

Anyone using hardware wallets from other manufacturers should probably expect similar fake letters from this fraudster group in the near future as well.

[uchegod-21]

The first warning is; no company will request for your seedphrase or request that you upgrade your seedphrase for whatever reason. There is no such thing as seedphrase upgrade. Newbies should be careful with anything that attempts to make the seedphrase a main center of attention. You alone should have access to your seedphrase and can control it the way you want, never disclose it intentionally or unintentionally through means such as this.