1950 ish Pi Brand pie wedge slice container for lunchbox or picnic, travel

This was used by my mother to pack a pie slice in my father’s lunchbox in the 1950s. Pre-Tupperware! It is hard clear plastic. Fragrance and smoke-free It does have a small crack on the side of the lid, but does not affect its strength. It is smooth. It was lovingly used, and is a bit cloudy from age and use. Was pre-dishwasher years, so never put in a dishwasher. Please see photos for cosmetic condition and ask any questions you may have. The brand was Pi as you see on the lid. 🇺🇸 USA patented and made.