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My two DT300i's and the previous Yager 200i all used a metric machine screw with either an 8 or 10 mm hex head and a captive washer. Lowe's, O'reilly's, Advantage Auto have all kinds of metrics but probably not captive washers. Already suggested by Neil to take the orphan to one or all of these places and get four the same. Now, you can get fancy and make your own captive washers if you want. Just say the word and I'll tell you how.

I seriously doubt any remaining dealer is gonna have these but you might get lucky....

I took the screws down to two Autozone's, but no luck so far. The Downtown is my only transpo and ubers are expenzive and hard to come by in my area so I was hoping I could find the info online instead, haha. I suppose on my next day off I'll journey around and try to find a place to ask.

sounds like you should look up what tools look like on your computer,.  as screw drivers have a lot of sizes philips 0,. 1,. 2,. 3,.
torex screw driver   t 10,. t15,. t20 t25,. t 30,. t 35 ,. t40 and bigger,.  allen Keys Hex ,  Torex, sockets  6 point and 12 point and square metric and american standard,  Im 87 so I use impact drills to take things apart,  small drills , 5 volt.  reg. ones 12 volt,  and corded ones with high power,.  and use a Torque wrench to tighten nuts or you will break them off,  mostly the # 8 and #10 nuts  good luck and happy riding,.

Hmm a torque wrench is one I don't have, I'll make sure to get one too. This is my first bike, first vehicle ever, really. I want to do the job right.

A word of caution about trickle chargers. 

When my Triumph battery completely discharged recently, the trickle chatter wouldn't even light up!  A few hours with a standard charger then I was able to switch over to the trickle charger successfully!  I'm sure someone on here will know why this might be.  I'm guessing the output from a TC is way too low to retrieve a totally dead battery!

Ah, I see. I also have a plug in wall charger. Perhaps I can get it started with that and then finish it off with the trickle.

By the way, all screws for seat and a bucket are 10mm, and all screws for battery cover are Phillips. So, very basic tools.
In my case for the seat, there are 2 hinge and 2 strut nuts. First undo strut, because then You can fully open the seat to undo the hinge.

Awesome, so all I'd need is a phillips and a 10mm screwdriver to access it and put it back together again?

Thank you everyone for your awesome advice! I'll post back soon with an update!