What to think?

Here's the most likely explanation: he has a secret girlfriend, but she is a Russian spy. She has stolen sensitive material from the Trump administration, which can be used to blackmail the government, because they contain evidence that the president is a homo. But the whole thing has been discovered by the NSA. Now she is hiding in his attic, but, unfortunately, she lost her parfume, and Robert Swan Mueller III has already been informed.

Your friend's life is at risk!

A sample could be from a women’s magazine or sometimes they are mailed advertisements.

The girl needs to chill

It's a mystery where its come from but its a small sample so easily could have fallen down there unnoticed.

If it's only a sample bottle it may of been a free handout from a department store make up counter

Who has placed/left the bottle there?

she's getting perfume for xmas