I found a new $5,000 gift card in the street of borough park, can I keep and use it?
Thank you for your question.
A gift card of $5000 is quite a rare find, and there are not that many of them around, therefore the card would be considered as having a siman. Therfoe since it was found in Boro Park, which is a place that have mostly Jews, you should try returning it, by putting up signs in the area that it was found. Alternatively it might be possibly to find the owner thru the company that issued the gift card.
Best wishes and tizku l’mitzvos.