Finding specific part in an object array?

I've made a system where a player can place cubes. However, I'm now I'm trying to make a system that makes sure the cubes are placed within a certain region, and if not; it shouldn't get placed.

The region is supposed to cover anything over top of specific part (plot) and within its size.

This is what I got for this specific section of the code. (part is defined further up and is a 3x3 cube)

			local plot = game.Workspace.Bases:FindFirstChild(game.Players.LocalPlayer.Name)
			if part.Position.Y >= plot.Position.Y then
				
				local min = Vector3.new(plot.Position.X - plot.Size.X/2, plot.Position.Y, plot.Position.Z - plot.Size.Z/2)
				local max = Vector3.new(plot.Position.X + plot.Size.X/2, part.Position.Y, plot.Position.Z + plot.Size.Z/2)
				local region = Region3.new(min, max)
				local parts = workspace:FindPartsInRegion3(region)
				print(region)
				print(part.Position)
				if parts[part] == part then
				--And it would theoretically run the code here, there's obviously irrelevant code below this

However, it goes to my else statement every time which is set to just destroy the cube. The printing lines came out as

-37.5, 2.00000596, -469.5, 1, 0, 0, 0, 1, 0, 0, 0, 1; 120, 1.99998808, 120

15, 3, -492

The large span of numbers from the region makes me think maybe I used it wrong? I'm not sure where to go from here.

EDIT : I ran code like this

				local guide = Instance.new("Part")
				guide.Parent = game.Workspace
				guide.Anchored = true
				guide.Size = region.Size
				guide.CFrame = region.CFrame

to see the exact size and shape of the region. I then came to the conclusion, I had done the region right as it was exactly how it should be. This makes me even more confused however.