Did you implement any of the ideas here OP?

Prep romaine leaves, get yourself some sliced salmon, and try the small packs of guacamole. I do wraps with those, sometimes substituting a boiled egg instead of salmon.

Fresh peaches or mangoes + plain yogurt or greek yogurt, yum!

Ham + cheese sandwich

Amy's Cashew-something frozen dinner. Soooo good.

Bagged salad kits. Have everything you need, add to a bowl and mix. Super easy.

Boiled eggs in the bag at the grocery. Best idea ever. Slice these + avocado + fresh slice tomato on a bagel or English muffin, and oh my! Delicious

-can of nuts (and kind)
-hummus and baby carrots
-if you have the freezer space at work, keep a bag of frozen strawberries or whatever. Then in your office keep a carton of whey protein and a blender. You can just use fruit, whey protein, and water and make a great smoothie with 30 grams of protein, about 300 calories total. I often use this as a meal and it keeps me very full.

Johnsonville flame grilled chicken. Individually wrapped, small portion. I just heat for a minute in the microwave and serve with broccoli or brussels sprouts.

I take a troth of food with me on Mondays -- we have a very large fridge/freezer though. If there's space, I suggest taking a few day's worth of food at a time.

1/2 dozen of eggs. There are mini egg cookers on Amazon and you can fix your eggs at the office. (I don't do this but other people do.)

Pre-cooked sausage -- you can just reheat those in the microwave.

Pre-cooked chicken breast and bagged salad for lunch. You can get fancy and add avocado or other toppings.

Nuts/seeds

I also take strawberries and blackberries.

If there isn't enough space, spend an hour on Sunday evening prepping containers to just throw in your bag in the morning.

Good luck - it's MUCH CHEAPER and more satisfying!