MORE ADVICE INCOMING!!
So since I put a reward on sale and thus ended up being flooded with messages, I soon found out that for bigger creators it can sometimes be hard to find tippers. However I found out the main ways that it can be done (other than just looking at your highest tippers of all time overall):
The dashboard method
Go to your dashboard. Go to tips. Scroll down to tippers. Change the "all time" to the current month.
This method is good for finding tippers who tipped high amounts all in this one specific month.
The date method
If the person tipping says something along the lines of "I just tipped you x and i would like....", that probably means they did tip it just now. The fastest way to then find them is to go to your profile, click your tippers (the number next to your total sub count number) and click "date". The most recent tippers will be seen there.
The name method
Do the date method, except you click "Name" instead. Now if you are a big creator, you will have 100+ pages of tippers. Here's where your problem lies, right? How on earth will you find your tipper?! And you can't jump to a specific page number or letter!
But there's a trick. Click "next". Now look at the adress bar.
My link looks like this: https://tapas.io/MaryYana/tippers?pageNumber=2&order_by=NAME&since=1516231447000
See the "pageNumber=2"? This is what you use to quickly skip pages. So lets say the tipper's name starts with J. Look at the amount of pages you have and make a quick estimate in your head of where you think the J might be. 40 maybe? Type that in instead of the 2 and press enter. Now look at the usernames that pop up and see if they start with a letter before J or after J. Adjust the adress bar and press enter again. Once you get close to the name alphabetically you can start just clicking "next" or "previous" until you see the name. Or don't see the name, if the "tipper" is lying to you.
This all sounds complicated, but once you get in the habit it goes pretty fast.
This method is good for: whenever the other ones don't work! It is a surefire way to find the tipper you are looking for. Slightly slower so it's a last go-to.
If the person contacted you via email and you don't find the tipper with the Name method, answer the person asking them if they are sure they provided you with the correct username. Sometimes people use different names in different places and mix them up! However BEFORE YOU DO THIS!! Look at their email. Sometimes their tapas username is automatically generated from the part of their email that comes before the "@"
The adress bar method
Sometimes a user who emails you will provide you with the username they signed up with, but their actual username is another.
In order to check if this is the case with a tipper you are struggling to find with any of the above methods, go to your profile/wall. Look at the adress bar. Replace the username in that adressbar with the username you are trying to find, without spaces if the person provides those, and press enter. If a result pops up, revisit the previous methods and hunt in the tippers list for the account you just found!
Good luck to you all and I wish you much success with your tipping reward systems!