Nineteen community resolutions were issued to residents as part of visits to addresses.
Operation Jemlock was launched in 2019 to combat serious violence and knife crime in West Yorkshire.
It involves officers patrolling high priority areas to provide a reassuring, highly visible presence within those communities and the required enforcement when required.
Chief Inspector James Kitchen of Operation Jemlock, said: “Operation Jemlock is working closely with our colleagues in the UK Border Agency to identify those who are buying or attempting to buy knives, usually over the internet, which are illegal to own in the UK.
“I want to make it very clear to residents that just because a dangerous-looking weapon is available to buy on a non-UK website it doesn’t mean it is legal to import it into the UK or legal to have in your home and people who do so could be committing offences.”
He added: “Community Resolutions have been issued in today’s visits and residents should be aware that if we find them in possession of such weapons we will take positive action.
“This could mean a local resolution or education or arrest and prosecution. The weapons seized today were clearly created to cause serious harm and it is a good thing they are now out of circulation.”