A thing I got good at during the pandemic was breaking down cardboard boxes for recycling. I was not alone in that. During 2020 and 2021 there was a surge in demand for Smurfit Kappa’s packaging products. Bored and locked-down consumers had little option but to shop online. Smurfit Kappa, like Facebook and online poker, was one of the big winners from the pandemic. The share price surged 150 per cent in the year and a half after March 2020.  But Smurfit Kappa has suffered more than most since Russia invaded Ukraine. The share is down by half since late…