"I do not even know your name, yet you have my sincere thanks."

I offer my sincere thanks to you and your office.

As always, you have our sincere thanks for taking the survey.

To it I would like to add my own sincere thanks.

So let me express my sincere thanks to them too.

Again, sincere thanks for all the work you have done.

I would like to express my sincere thanks to everyone involved.

I would like to express my sincere thanks to them.

For this, I offer my very sincere thanks to everyone.

For this I would like to offer you my sincere thanks.