The problem is Clare, You are putting a female perspective on it
He is a bloke!
a. If you don't mention it and he sent it, he will assume it didn't work.
b. If you don't mention it and he didn't send it, he will be none the wiser.
c. If you do mention it and he sent it, he will be pleased with his accomplishments.
d. If you do mention it and he did not send it, he will probably say "That's nice dear
, While thinking 'Must be some saddo nerd to work out how to do something like that!'"
You see, men are too shallow to plot and scheme, it's far too complicated for us to consider all the eventualities.
Take option a. and you can't go wrong
And they say blokes don't understand Women!
Daz