Hi Welcome to the Forum!
I found that the plastic shroud under the radiator was missing
Although a bummer...there may be a condition where it suffered too badly from age-related road rash and other traveling diseases that take their toll on ANY vehicle.
If you think it's funny, I'm glad you have a sense of humor and can work with me on this, but in reality, no - it's not funny...
This is a personal choice, so if you want it back, remember that it's seen nearly a decade of low-clearance scrapes and bangs and bruises from the highways and byways of life you led it down and around on.
So when they took it off, if may have been too adhered onto the bumper skirt that when they tried to remove the fasteners. If it took some effort to remvoe it, that becomes an issue on them to obtain clearance needed to repair the transmission.
Reasons vary, but - the fasteners are the key here. If they didn't, or could not be, saved to be reused or the splashguard itself was too badly "used up" to keep it in use - they should have at least asked you if you needed it, for they may have to explain that the work needed to service the car, required the guard to be removed but, by their determinations, it is too badly worn-out to be effectively placed back on the vehicle.
That's the rub, you are entitled to get parts back, but that doesn't mean you may want them back. Was it necessary to have it removed in the first place or did it just fall off - how?
Although a NEWER SPLASHGUARD CAN HELP WITH APPEARANCES AND SOME OTHER EFFECTIVE MEANS OF ROCK AND ROAD DEBRIS, THE AGE OF THE VEHICLE TAKES PRECEDENCE. They needed to notify you. The fasteners used on the bumper to splashguard - can wear out and rust can enlarge the holes - making it nearly impossible to refasten the guard back on the bumper - but then too, how was the guard removed? Carefully? Or, is negligence being shown?
IF you recently took some pics of the vehicle before you got it serviced, you can use it to show them the previous condition if you want the splashguard returned - if they cannot replace it back on the car, they are not always entitled to keep it and throw it away unless you request they do so, it also is reciprocal, they are not responsible for the splashguards age and condition upon arrival to the shop, and its' ability to survive to this point in time unless there was proof - to show it was in working condition - that burden is on you to show that. .
I personally took mine off due to the damages the front bumper skirt can receive from the guard dragging on the ground due to road and driveways that use or are designed with deep drain or steep rises - it can damage the bumper and or front frame from the impacts and scrapes - living in the area I do, the Fiesta is a great car, but it's also made with a "low clearance" design - which adds to this problem.
