There are only 2 items you check with the DNA analyzer: the fur from Puerto Rico and the egg shells from New Jersey. If you follow the test process carefully (and press the devleop button on the developer), Mews will tell you the results.
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Run the fur through the DNA analysis, but you find that it is only coyote fur. You will have to go back to Puerto Rico to find more evidence.
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Bring them back to the Mews lab for DNA testing.
It's not the chicken eggs, it's the egg shells from New Jersey. When run through the DNA testing, the egg shells from the nest in New Jersey prove the existence of the Jersey Devil.
Show them to Mews then follow the instructions on the DNA test. After the x-ray tray is in the developer, press the flashing button to get the result.
You process the samples for DNA in the Lab, the left side of the Museum in the Mews mansion. (It is on the first floor to the right.) Follow the instructions to test samples, and show any photos to Mews.
You place one of the samples (fur or egg shells) in a vial and follow the instructions on the right side of the screen. When the x-ray grid is in the developer, push the flashing button.
Take the shells back to the Mews lab and test them. The DNA analyzer will prove the existence of the Jersey Devil.
You get the fur from a fence in Puerto Rico. Back at the lab, you run a DNA test, but it turns out to be ordinary coyote fur.
The final step in the DNA testing is to put the x-ray film into the developer. The button will flash, so you should press it then. It was supposed to be labeled but wasn't.
You obviously have no chance to "catch" it. But you know it exists. Once it flies away from the old creepy house, use the grappling hook (from the attic) to climb the tree and collect the egg shells, evidence that it exists. Run them through the DNA tester at the museum.