Questions about tax returns and application costs

Last year I had around 8 job interviews, for which I drove quite a distance, sometimes 5-8 hours. I received reimbursement for travel costs from some, but not from others. I can now declare the travel costs that I did not get reimbursed in my tax return (I use Smart Tax). I'm wondering whether it's almost unbelievable and whether the tax office can cause me problems. If I give everything and calculate it at 0.3 cents / km, I get almost €2000