Trading in Airpods Max Price

If I trade my Silver Airpods Max, how much would I get back from Apple? They are in prestigious condition and completely brand new. I received them 7 days ago and opened them 2 days ago and have not worn them.

Would it be worth it to trade them in then purchase a new pair of the Space Grey Airpods Max? Or should I attempt to sell them elsewhere?

More information: I cannot exchange or refund them since my product is unsealed and I bought them not with Apple.