This comes from Betty and Veronica Double Digest No. 96. The story is called Little Betty and Veronica & the Buried Treasure, but I’m not sure why. It isn’t really about them, but about Archie. Why didn’t they just call it Little Archie & the Buried Treasure?
For more Archie Comics, go to Archie Andrews: A Real Foul Ball
For more Betty & Veronica, go to Betty and Veronica: Stranger Than Fiction
For more treasure hunts, go to How to Wash a Cat
For more mystery reviews, go to Emilie and the Sky World