If you shop around, you can find both 5e and 6 junction boxes for sub $4.00 each. I get mine from East Ohio somewhere, but I don't remember where. I have about 5 in stock. It's ugly when some clown extends cables in the ceiling with a 5e jack and crimps a 5e plug on the extended cable. I found it, because the cable leaving the source was white and the cable at the drop was blue :-)

When it happened, my tester said "Volts!" on the blue leg. I just used the whole mess as a pull cord and replaced the 135' run.

Here's a link to the inexpensive junction box https://www.electriduct.com/Junction-Box-Punch-Down-Type.html

Carl