Selling agent might suggest to replace the missing microwave as the cost is barely a $100 and if the seller doesn't want to do that and for some strange reason it would jeopardize the deal (almost impossible but you never know!) as a selling broker I would get it for my buyers as a house warming gift :)
Vivienda Miami Real Estate Group
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If the home is old enough, then it may simply have had a microwave resting on the counter. No one will miss this. But if the microwave was built in and is now missing, it looks odd to the buyers.
Nonetheless, the Miami home price is not likely to be dramatically affected by the lack of a microwave oven.
If you are the owner of his Miami home for sale, spend t he money to put one in. The cost of the microwave and the installation will be more than offset by the money you receive in return.
Marc Jablon, The Jablon Team
RE/MAX Complete Solutions
Many people have no use for them, and others can't live without them.
Unless there is a place where the microwave is "obviously missing, removed, or inoperable", there should be no problem.
As stated by Meg, you can always buy one for the buyer as a housewarming gift.