Idk about greyhound specifically but there's different bus companies that do pick ups at like 7-11 or like random walmarts/targets. Also Main St station and Staples Mill amtrak.

There still seems to be tickets available from the Greyhound station idk https://shop.greyhound.com/search?wheelchair=0&utm_campaign=4154879760.16450005751_139683059211.649280698442_kwd-371278149981_9008459__&departureCity=fefedffb-19fe-4ff5-ada8-47d715705a5a&utm_medium=sea-nonbrand&arrivalCity=adcc1f7d-3bfe-471d-9946-28253814a09b&rideDate=04.04.2023&bike_slot=0&utm_term=bus%20richmond%20to%20dc&gclid=Cj0KCQjwiZqhBhCJARIsACHHEH-p4jEHclxYEc3Je8FKcliv2WcuGptfIwH0i9CjkaMPdWQR1nwggw4aArskEALw_wcB&us_children_2_15=0&adult=1&utm_source=google&utm_content=us-com.greyhound&features[feature.darken_page]=1&features[feature.enable_distribusion]=1&_locale=en_US