We made wills this summer and they were witnessed by a couple who live locally.
Unless we end up with a complicated family situation, I imagine they'll stay as they are (very straightforward) until we die, which could be several decades. (Fingers crossed!)
This is hypothetical because our will really is very straightforward and there's no reason anyone would contest it but what happens in the future is there is a problem but the witnesses can't be found? Would they even remember doing it anyway, or they could predecease us.
On that basis how would anyone know if we'd just made some names up?