Good Evening @Seller_e486SI9EcwYdG - I wanted to follow up here to let you know @Seller_7LrAV0m5llaI7 is correct. I am linking a help page -->HERE<-- on listing products for Fulfillment by Amazon and wanted to call out the specific section:

When you close or delete an FBA listing, any inventory that you have in Amazon fulfillment centers will not be returned or disposed of until you submit a removal order. For more information, go to the "Close a listing" and "Delete a listing" sections below and our Remove inventory (overview) help page.

I hope that helped answer your question. Please let us know on this discussion if you require additional assistance or you can always contact Selling Partner Support with inquiries at anytime. Thank you for checking in with us on the Seller Forums and for choosing to sell on Amazon. Have a great rest of the week! ~ Cooper_Amazon