I thought you have to be able to read the full summons to be legally considered as received. Not too familiar with US law though.
Where I'm from there's a way of a public delivery if someone absconded, by posting it on the black board of the local city hall of someone's current registered address for 4 weeks or something.
If they failed to change the registered address they'd also be committing a federal crime, so if they were to contest the lawful delivery, they'd admit another offense, landing them in jail where they could then be successfully served. So that would at best reset the timer at the expense of a felony.