Are you sure you restored to your mongod on port 28000
Your mongodump is from port 28000 which you piped to restore on localhost on default port 27017
What do you see if you issue just mongo
Are you sure you restored to your mongod on port 28000
Your mongodump is from port 28000 which you piped to restore on localhost on default port 27017
What do you see if you issue just mongo