I would urge you not do this ( no gift ), just stop by their office and say thanks.
- Do I have to give a gift to my boss?
You absolutely do not need to give a gift to your boss – and what’s
more, you shouldn’t.
There’s very clear etiquette on this, which says that gifts in a
workplace should flow downward, not upward. That means gifts from
bosses to employees are fine, but employees should not be expected to
give gifts to those above them.
This rule is understandable when you think about the power dynamics in
the boss-employee relationship. People shouldn’t feel obligated to
purchase gifts for someone with power over their livelihood, and
managers should never benefit from the power dynamic in that way.
Take a look at this for more information: US News