There are 6 total Opulent Chests, 3 in Royal Pools and 3 in Pleasure Gardens. Looking at the description of your key will give you a hint of where the right chest is located. If you visit the appropriate one and it still says the key doesn't fit, could you provide a video or screenshots of the key description and chest?
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I feel so dumb now. I did some grinding at the beginning of the season but I didn’t remember there being 6, I only remember the 4 chest. I deleted the keys when I couldn’t find the right chest so I can’t send a screenshot, but I appreciate the help!