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The case of Carole Baskin's disappeared husband, Don Lewis, is going the route of 'Don't F**k with Cats' -- with an online group claiming it's dug up a massive, and crappy, clue about where his body might be.

Jack Smith -- the spokesman now repping Don's family -- tells us he and a group of internet sleuths joined forces earlier this year after the premiere of 'Tiger King' and formed a Facebook group to search for the truth about Don's still-unsolved disappearance in 1997.

RipperJackMedia

Welp, we're told the group believes it discovered a new lead, tied to an existing theory about Don -- namely, that he was allegedly buried on his and Carole's animal sanctuary property under a septic tank system.

According to Jack ... the research team has obtained the actual receipts and permit paperwork for the septic tank's installation. Carole has publicly acknowledged two septic tanks -- one that she claims was installed well before Don's disappearance, and another installed well afterward.

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Fox 5 Atlanta

BUT, if you believe what Jack and co. claim these receipts show ... a septic tank system was, in fact, worked on and installed right around the time of Don's disappearance ... 23 years ago this month.

They claim the receipts show a permit to install the septic tank was pulled on August 4, 1997, and that work on such a system was completed by or before the 15th later that same month, with a mound of dirt delivered to Carole's address the day prior.

So, what does that all mean??? According to Don's family and this crack Facebook team of investigators, it points to the possibility that Carole wasn't truthful with her timeline ... and that Don may very well be under the ground,

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