Epson 3865X Plus - Manual (Page 247)

Guide the tabs on the front of the subassembly over the
opening in the front of the computer so that the two small
tabs sit behind the opening and the large tab with the
curved lip sits over the front of the opening. If necessary,
press on the large tab until the subassembly snaps into
place.
9. To replace the front panel, fit the three ridged tabs on the
bottom of the panel into the three notches on the lower
edge of the computer, as shown below.
tabs front panel
B-56 Installing and Removing Disk Drives