This is a new air curtain display case. We do not have a key to lock the night curtain on it, but it should be easy to get one made.

Some information from online:

For your establishment's refrigerated merchandising and self-serve needs, look no further than this Federal Industries Vision Series VRSS-4878S 47 1/4" high profile refrigerated self-serve merchandiser with four shelves! This merchandiser is great for displaying pre-made salads, cold sandwiches, and chilled drinks. Specially designed for cold products, this merchandiser holds chilled products at 38 to 40 degrees Fahrenheit to make sure your food and beverages stay at safe temperature. This merchandiser features a durable, welded, powder-coated steel base with glass or solid end panels and a metal front and rear construction that guarantees a high-quality unit that withstands the hustle and bustle of a commercial environment.

Four adjustable shelves can be installed slanted or flat, allowing you to customize the configuration of the interior to suit whichever items you are displaying, and the shelving comes with price tag molding so you can display item pricing right there in the unit. An LED top light assures that customers' attention will be drawn to the contents within, while on-demand defrost capabilities ensure that price tags stay legible. A night curtain is also featured in this unit, cutting down on energy waste and saving you money.

Overall Dimensions:
Width: 47 1/4"
Depth: 33"
Height: 78"
Capacity: 25.74 cu. ft. and 735lbs