Well, off to a flying start here in Hudson NY.

Topping off the coolant I watched amazed as a small piece of the tin
seal from the coolant container came loose and went into the coolant
tank.  After fishing around for a while blindly with a piece of wire to
try and fish it out I decided it might be better to ask whether it's a
problem or not.  So - will this destroy my engine or is it ok not to
worry about it?

thanks

Antony Widoff