3 things that make a relay look factory fitted

[His Dudeness]

Yea good quality electrical connectors aren't cheap but as you say if you make the investment and buy a box you should have them for life. Soldering isn't cheap either. You need a decent soldering iron with a bit of power, good quality leaded solder, rosin flux, cleaner for the iron tip and heat shrink. It all adds up but it's a good skill to have if you can repair wiring I'd like to get a really nice crimper tool for doing the OEM style block connectors. Another tool to add to the list :lol