Is-in-box
From FreeSpace Wiki
Whether an object is in the box specified. If a second ship is specified, the box is relative to that ship's reference frame. 1: Ships or wings to check 2: Min X 3: Max X 4: Min Y 5: Max Y 6: Min Z 7: Max Z 8: Ship to use as reference frame (optional).
Comments
Somewhat similar to num-within-box in effect, but is-in-box can use a dynamic reference ship. Num-within-box requires a get object position SEXPs to make dynamic).