Ah, that makes some sense.
In a similar vein - I had a letter out of the blue a few months ago that referred to some mystery relating to my late father and finance - bearing in mind that my father died in 1994 this seemed like a potential scam . . . but after a bit of research the ender appeared to be genuine, and I had to reply via a solicitor to find out what it was about. [I was an executor and despite having moved house twice since 1994 they tracked me down]
Anyway it turned out that the share registry for a public company had unearthed a few shares that my father held and there was a current value plus 26 years of accrued dividends - don't know how we missed it for probate? Anyway, after some identity stuff the upshot was a cheque for about £1,100 from the proceeds net of some admin costs and a commission charge. I treated myself to a reproduction Eames chair and footstool