The Pilgrims lost 4-1 at the impressive Proact Stadium after a brace from Bradley Bowland and further goals from Cormac Noel and Jake Beesley did the damage for Dave Bentley’s side.
Eyett replied with a penalty, but United’s first-ever involvement in the Midland Youth Cup culminated in consecutive group stage defeats to Lincoln City and Chesterfield.
Boston (4-4-2): Sam Vince; Niall Delahoy, Charlie Melville, Josh Spencer, Charlie Rossington; Curtis Revell, Aaron Eyett, Jordan Sowerby (Leon Squire 53), Lewis McKue (Juris Kormis 53); Jordan Nuttell (Macauley Britton 35), Joe Briers. Sub (not used): Karolis Andriulionis.