Generous guests

Exploration Stage: Greenhouse
From: Mario Bonmarito
Description: According to the mayor, the hotel regularly contributes to the city's revenue. This city is not an easy place to visit, so you would never expect the hotel to have guests. For now, let's add this odd banknote left by an unidentified guest to the funds column...oh! The bill has flown away! Can you help me collect them?
Completed: This banknote is in the shape of an oak leaf, and it scatters in the slightest breeze just like a real leaf. But they seem to be worth quite a bit of money. If this is added to the revenue, it should make the city of Shadow quite wealthy.