Not that this is what happened here, but just FYI… so yes, there would be evidence/unmistakable evidence...
Little graphic in regards to mountain lion attack evidence –
Mountain lion kill is typically…
…under cover (brush, shrubs, trees). Lions tend to not leave their food out under open sky. An exception may be if the deer was killed in a fence enclosure, and then the lion is likely to have dried dragging it past the fence.
…covered with leaves, sticks, grass. There will be an area around the deer (or other prey) where the raking of the lion’s paws left bare dirt.
…eaten starting at the ribs. Lions tend to eat the chest-area organs first (lungs, heart, liver). They chew a hole in the ribs to get to these tasty and most-nutritious morsels (Yikes…. ).
…missing the stomach. Lions remove the stomach (called the rumen) when they first open the check cavity and bury is a few feet away from the body. This prevents stomach acids from spoiling the meat over the 3-5 days it will take the lion to finish eating the entire deer (or other prey).
…”shaved”! Yes, you read that right. Lions will nip the hair off of the body of a deer (or other prey) before they start chewing into it. Think of a surgeon shaving the patient before cutting. The clumps of nipped hair are about 1” across – the distance between the lion’s canine teeth. They snip the hair with their incisors.
…neat and tidy. The deer is usually in one piece (rather than scattered about – a leg here, a leg there…).
Resource:
http://www.santacruzpumas.org/2014/03/lion-kills-vs-coyote-kills/