Leave Some Bitcoin in Time Capsules

I was at a local City Council meeting yesterday and a heritage group was sponsoring a 50 year time capsule to be buried under the city square. No chance, no how, no way anyone in that room understands anything about BTC. But in 50 years????

It occurred to me that it is my civic duty to donate some sats to the city and give them an unexpected healthy donation when it gets opened. Just include the seed with a "You're Welcome" message.

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Edit: More details on this about the security because someone in the chamber asked the same questions you guys are.

So the capsule they purchased is a custom built professionally sealed container specifically designed to protect the contents. There are companies that specialize in these things. There is a chemical process they use which changes the air inside to an inert state which increases the longevity by a factor of 25:1. (So contents would only degrade by an equivalent of 2 years.)

The town square has several security cameras. And it would be a random envelope so nobody would know I'm burying BTC in there besides myself. It's a donation so if something happens well then ok...