It's a risk you took and you trusted in the fact that thing was full of burrs and they all got cleaned out.. majority of them are fine to just start up... but, if you spend $300 or more on an engine with no warranty.. I think it is wise to check... so, don't belittle my advice.. it's good advice... you just have to have knowledge of disassembly...
so, please don't say "apparently not" because until you see someone ruin a brand new engine because of a piece of metal left behind you cannot make a statement like that.. because it's not apparent on just one engine having success